Sorry to seem fussy but can we please have the British spelling of 'LICENCE' instead of the U.S spelling.
In our experience having only seen a sailing boat once on the Ebro, much of the Ebro is not navigable due to weed.

There used to be a catamaran based in Tortosa and with its low draft could get down to Amposta.  Between Amposta and Tortosa in the summer it can be unpassable, due to the river levels being very shallow and large areas of weed beds.